Method of removing impurities and similar matter from staple fibres in ringless spinning and device for performing said method

ABSTRACT

A method of removing impurities from staple fibres in ringless spinning and a device for performing said method. The impurities are ejected immediately after being contacted by the combing roller into a withdrawing space by the effect of the acceleration imparted thereto by said contact. Spinning units including a fibre separating mechanism and a rotary underpressure spinning chamber are employed. The inlet or the guiding walls for said impurities are directed in view of the separating roller tangentially. The withdrawing space can be connected to the central sucking device of the machine.

.Iadd.This is a continuation of application Ser. No. 541,412, filed Jan.16, 1975, now abandoned. .Iaddend.

The object of the present invention is a method of removing impuritiesand similar matter from staple fibres in ringless spinning in spinningunits including a fibre separating mechanism and a rotary underpressurespinning chamber, and a device for performing said method.

In ringless spinning are various impurities, as e.g., fragments ofcapsules, kernels, and leaves of cotton, fibre conglomerates andpeelings of synthetic fibres are the frequent reson for yarn breakageand have an unfavorable effect on the quality of the spun yarn also bycausing a filling of the collecting surface of spinning chambers, thuscausing a change of the values of the spun yarn, whereupon arises thenecessity of removing periodically the said impurities.

The indirect influence of these impurities in the fibre material to beprocessed in the spindeless spinning machines is hitherto avoided bydemanding a higher degree of cleanliness of the presented sliver thisbeing connected directly with higher expenses for the preparation of thefibre sliver. Even thus it is impossible to attain a particularlyfavourable state.

The present invention has the purpose to remove the said disadvantagesand to establish a method of and a device for enabling the spinning offibrous materials to be processed even when lower requirements are puton the material as to the content of impurities.

The subject matter of the method according to the present inventionconsists in that the impurities are ejected immediately after beingcontacted by the combing roller into a withdrawing space by the effectof the acceleration imparted thereto by said contact.

The subject matter of the device for performing said method consists inthat the inlet into the withdrawing space is made in the wall of thehollow of the body of the fibre separating mechanism which is situatedoppositely to the operating part of the combing (fibre separation)roller, in the section between the separating zone and the passage ofthe hollow into the exit channel. It is advantageous according to thepresent invention when the inlet is directed at least approximatelytangentially in view of the fibre separating roller.

According to the present invention, at least approximately tangentiallydirected guiding surfaces can be arranged at the inlet, or said inletcan be constituted by channels arranged behind each other.

An embodiment is advantageous, in which the width of the inlet is equalat least to the width of the operating part of the fibre separatingroller.

From the viewpoint of attendance, an embodiment is favourable, in whichthe withdrawing space is connected to the central sucking device of themachine.

Embodiments in form of example according to the present invention arediagrammatically shown in the accompanying drawings, of which

FIG. 1 represents a section through the fibre separating mechanism;

FIG. 2 an embodiment with an inlet including guiding walls;

FIG. 3 an embodiment of the inlet including channels;

FIG. 4 a view through the inlet as shown in FIG. 1, on the fibreseparating roller.

The staple material 1 is fed by the feeding roller 2, and passes throughthe resilient condensing plate 3 to the fibre separating roller 4 whichrotates at a high speed, the cylindrical operative part of said rollerbeing provided with fibre separating tips 41. At the point of thestrongest action of the fibre separating roller 4 upon the fibres ofsliver 1, i.e., in the so called fibre separating zone 5, separation offibres from the sliver 1 takes place. The said fibers combed out fromthe sliver 1 are brought into the exit channel 6 which debouches on thesliding wall of a not shown, known spinning chamber, in which saidfibres are transformed into yarn, all this being generally known.

In the zone between the fibre separating zone 5 and the passage 711 ofthe hollow 71 of body 7, in which the separating roller 4 is arranged,an inlet 8 is provided in wall 712 into the withdrawing space 81, at aposition opposite to the operative part of the fibre separating roller4.

This inlet 8 has advantageously an at least approximate tangentialcourse in view of the separating roller 4.

In the embodiment as shown in FIG. 2, tangentially arranged guidingwalls 82 are mounted in the inlet 8.

In the embodiment as shown in FIG. 3, the inlet is constituted bychannels 83 arranged mutually beside each other.

It is advantageously when the width of the inlet 8 is at least equal tothe width of the operative part of the separating roller 4 as can beseen in FIG. 4.

The withdrawing space 81 can be emptied periodically or can beadvantageously connected to the diagrammatically illustrated centralsucking device of the machine (see FIG. 1).

Immediately after being contacted by the separating roller 4, theimpurities as given above, which have a heavier mass than the fibres tobe spun, are ejected upon action of the centrifugal force exerted by theseparating roller 4 into the inlet 8, through which they are broughtinto the withdrawing space 81, from which they are removed eitherperiodically or continuously by the central sucking device. Togetherwith the mentioned impurities, also too short fibres can be removed insuch manner, which would be useless as a part of the yarn to be spun.

What we claim is:
 1. In a method of ringless spinning, the steps ofadvancing impurities-containing unopened fibers in a path leading to aspinning chamber; opening said fibers during advancement of the same sothat impurities are liberated from them; continuously discharging theliberated inpurities from said path into a withdrawing space which is inopen communication with said path; and continuously withdrawing thedischarged impurities from said withdrawing space by suction.
 2. Amethod as defined in claim .[.2.]. .Iadd.1.Iaddend., wherein the step ofdischarging the liberated impurities comprises accelerating the same ina direction outwardly of said path.
 3. A method as defined in claim 2,wherein the step of opening said fibers comprises subjecting the fibersto the combing-out action of a carding roller.
 4. In an apparatus forringless spinning of fibers, a combination comprising fiber passagemeans for advancement of fibers towards a spinning chamber; supply meansfor supplying unopened fibers into said fiber passage means; fiberopening means for opening said fibers during advancement thereof in saidfiber passage means towards said spinning chamber; impurities dischargepassage means communicating with said fiber passage means for continuousdischarge of impurities which are liberated from the opened fibers; andsuction means in open communication with said impurities dischargepassage means for continuous withdrawal from the same of dischargedimpurities.
 5. A combination as defined in claim 4; further comprising ahollow body having said passage means formed therein; and wherein saidfiber opening means comprises a fiber opening roller rotatable in saidhollow body.
 6. A combination as defined in claim 5, wherein said fiberpassage means comprises a first passage portion extending downstreamfrom said supply means for advancement of unopened fibers, and a secondpassage portion extending from said first passage portion towards saidspinning chamber for advancement of opened fibers; and wherein saidimpurities discharge passage means communicates with said fiber passagemeans between said passage portions of the same.
 7. A combination asdefined in claim 6, wherein said impurities discharge passage means hasan inlet which communicates with said fiber passage means at leastsubstantially tangentially with reference to said fiber opening roller.8. A combination as defined in claim 7; and further comprisingtangentially oriented guide baffles mounted in said inlet.
 9. Acombination as defined in claim 5, wherein said impurities dischargepassage means has an inlet which communicates with said fiber passagemeans; and further comprising guide baffles mounted in said inlet andoriented substantially tangentially with reference to said fiber openingroller. .Iadd.
 10. In an apparatus for ringless spinning of fibers, acombination comprising fiber passage means for advancement of fiberstowards a spinning chamber; supply means for supplying unopened fibersinto said fiber passage means; a fiber opening roller for opening saidfibers during advancement thereof in said fiber passage means towardssaid spinning chamber; impurities discharge passage means communicatingwith said fiber opening roller for continuous discharge of impuritieswhich are liberated from the opened fibers; and means in opencommunication with said impurities discharge passage means for receivingfrom the same the discharged impurities, said impurities dischargepassage means having an inlet which communicates with said fiber passagemeans at least substantially tangentially with reference to said fiberopening roller. .Iaddend. .Iadd.
 11. In an apparatus for ringlessspinning of fibers, a combination comprising fiber passage means foradvancement of fibers towards a spinning chamber; supply means forsupplying unopened fibers into said fiber passage means; a fiber openingroller for opening said fibers during advancement thereof in said fiberpassage means towards said spinning chamber; impurities dischargepassage means communicating with said fiber opening roller forcontinuous discharge of impurities which are liberated from the openedfibers; and means in open communication with said impurities dischargepassage means for receiving and removing from the same the dischargedimpurities, said discharge passage means having an inlet whichcommunicates with said fiber opening roller and which has guide meansthat are substantially tangentially oriented with reference to saidfiber opening roller. .Iaddend. .Iadd.
 12. A combination as claimed inclaim 11, wherein said means in open communication with said impuritiesdischarge passage means are operatively connected to a central suctiondevice. .Iaddend. .Iadd.
 13. In an apparatus for ringless spinning offibers, a combination comprising supply passage means for supplying astream of air and opened fibers to a spinning chamber; fiber passagemeans extending to and communicating with said supply passage means foradvancing fibers to the same; supply means for supplying unopened fibersinto said fiber passage means; a fiber opening roller for opening saidfibers during advancement thereof in said fiber passage means towardssaid supply passage means; impurities discharge passage means fordischarge of impurities which are liberated from the opened fibers, saidimpurities discharge passage means communicating with said fiber passagemeans closely downstream of the region where said fiber opening rollerexerts its maximum opening effect upon the unopened fibers but ahead ofsaid supply passage means so that the impurities discharge has no effectupon the flow of said stream in said supply passage means; and meanscommunicating with said impurities discharge passage means for receivingthe discharged impurities from the same. .Iaddend. .Iadd.
 14. Acombination as defined in claim 13, wherein said supply passage meansextends tangentially of said fiber opening roller and the opened fiberswhich are freed of said impurities travel with said fiber opening rollerfrom said impurities discharge passage means to said supply passagemeans and are discharged into the stream of air flowing therein..Iaddend. .Iadd.
 15. In a method of ringless spinning, the steps ofguiding in a first path a stream of air which flows towards a spinningchamber; advancing impurities-containing unopened fibers in a secondpath which discharges into said first path; opening said fibers duringadvancement of the same in said second path so that impurities areliberated from the fibers; discharging the liberated impurities fromsaid second path ahead of said first path so that the discharge has noeffect upon the air stream in said first path; withdrawing thedischarged impurities; and discharging the opened fibers from saidsecond path into said first path downstream of the location where saidimpurities are discharged. .Iaddend. .Iadd.
 16. A method as defined inclaim 15, wherein said step of opening said fibers is carried out with arotating fiber opening roller; and wherein said stream of air in saidfirst path flows tangentially of the periphery of said fiber openingroller and entrains the opened fibers travelling on said periphery..Iaddend. .Iadd.
 17. In an apparatus for ringless spinning of fibers, acombination comprising supply passage means for supplying a stream ofair and opened fibers to a spinning chamber; fiber passage meansextending to and communicating with said supply passage means foradvancing fibers to the same; supply means for supplying unopened fibersinto an inlet of said fiber passage means; a fiber opening roller foropening said fibers during advancement thereof in said fiber passagemeans towards said supply passage means, said supply passage means beingarranged to pass said stream of air by said fiber opening roller;impurities discharge passage means for discharge of impurities which areliberated from the opened fibers, said impurities discharge passagemeans communicating with said fiber passage means intermediate saidinlet and said supply passage means so that said opened fibers entersaid stream of air passing by said fiber opening roller in said supplypassage means only after discharge of the impurities from said openedfibers; and means communicating with said impurities discharge passagemeans for receiving the discharge impurities from the same. .Iaddend..Iadd.
 18. A combination as defined in claim 17, said fiber passagemeans having a fiber opening zone extending from said inlet to saidimpurities discharge passage means, and a purified-fiber travel zoneextending from said impurities discharge passage means to said supplypassage means and having an outlet communicating with the latter..Iaddend..Iadd.
 19. A combination as defined in claim 18, saidimpurities discharge passage means including an inlet opening whichcommunicates with said fiber passage means intermediate said zonesthereof; and wherein said supply passage means has an air intake remotefrom said inlet opening for aspiration of said stream of air so that thestream sweeps over said outlet to entrain the purified opened fibers andconvey them to said spinning chamber. .Iaddend. .Iadd.
 20. A combinationas defined in claim 17, wherein said impurities discharge passage meansincludes an inlet opening communicating with said fiber passage means;and further comprising at least one guiding wall in said inlet openingand extending at least approximately tangentially of said fiber openingroller. .Iaddend. .Iadd.
 21. An apparatus for removing impurities fromstaple fibers for ringless spinning in spinning units, comprising ahollow body, a fiber opening roller rotatable in said hollow body, saidhollow body having a supply passage through which unopened fibers aresupplied to said opening roller, and a spinning chamber, said hollowbody having an opened fiber discharge passage through which openedfibers pass from said opening roller to said spinning chamber, saidhollow body having an impurities discharge passage between said fibersupply passage and said opened fiber discharge passage for dischargetherethrough of impurities from fiber being opened by said openingroller, said impurities discharge passage extending through the hollowbody generally tangentially to the periphery of the fiber openingroller. .Iaddend. .Iadd.
 22. An apparatus for removing impurities fromstaple fibers for ringless spinning in spinning units, comprising ahollow body, a fiber opening roller rotatable in said hollow body, saidhollow body having a supply passage through which unopened fibers aresupplied to said opening roller, and a spinning chamber, said hollowbody having an opened fiber discharge passage through which openedfibers pass from said opening roller to said spinning chamber, and saidhollow body having an impurities discharge passage between said fibersupply passage and said opened fiber discharge passage for dischargetherethrough of impurities from fiber being opened by said openingroller, said impurities discharge passage extending through the hollowbody generally tangentially to the periphery of the fiber openingroller, said hollow body including a wall extending substantiallytangentially to the periphery of the fiber opening roller, located sothat the adjacent portion of the fiber opening roller periphery movestowards said wall and constituting a wall of the impurities dischargepassage. .Iaddend.